This can trigger fraud if the recipient of the transaction does not have sufficient understanding of how to prevent it.
Simple instruction for sellers:
wait for confirmation of transaction, will prevent any chance of double spending scam.
People can get tricked in crypto by some many ways if they don't understand how it works, and chance for double spending to happen in real life is much less than you think.
Fake wallets and fake bitcoions are more likely to happen, some people will convince you that bch or bsv are real bitcoin and you get scammed purchasing that garbage.
So now that bitcoin has been legalized in several countries as legal tender, do you think this double spending can prevent bitcoin from being used by many as a secure mean of payment so that adoption rates slow down?
I think that only El Salvador made Bitcoin a legal tender so far, but most people can only buy something with Bitcoin using government made add custodial wallet Chivo,
and I think that is based on Lightning Network so there is no way you can get scammed with double spending.
Some people tried to use other wallets for payment in El Salvador with QR codes but they are not working, except Chico and Muun wallet with LN.